Ovens by gas



(No Model.) r s Sheets--Sheet 1.

J. L. W.;0LsEN. APPARATUS FOR HEATING OVENS BY GAS. 7 No. 466,127. Pat ented nemz 1891..

I/I/IT/VESSES; [44 64/7015 /d%@/& m

' 4r7-0 A EYS,

(No Model.) 3 Sheets-:Sheet 2.

J. L. W. OLSE APPARATUS FOR HEATING 0v BY GAS.

No. 466,127. Patnte'd' Dec. 29, 1891.

TN By UNITED STATES PATENT OFFICE JOHAN LUDWIGWALDEMAE oLsEN, or COPENHAGEN, DENMARK.

APPARATUS FOR HEATING OVENS BY GAS.

SPECIFICATION forming part of Letters Patent No. 466,127, dated. December 29, 1891. Application filed July 10, 1891. $erial No. 399,011- (No model.)

To all whom, it may concern:

Be it known that I, J oHAN LUDWIG WAL- DEMAR OLSEN, manufacturer, of Copenhagen, Denmark, a subject of the King of Denmark, have invented certain new and useful Improvements in Apparatus for Heating Ovens by Gas, of which the following is a specification.

My invention relates to improvements in apparatus for heating bakers and similar ovens by means of certain gaseous mixtures; and its object is to enable the cheap mixtures of gas and airsuch as Dawson gas-to be employed economically and satisfactorily for that purpose.

In order that my invention and the best means by which it is to be carried into practical efiect may be thoroughly understood, I will now describe them in detail, referring, in so doing, to the accompanying figures, which are to be taken as part of this specification and read therewith.

Figure l is a rear elevation of the front' plate. Fig. 2 is a vertical section taken on the line 00 x of Fig. 1. Fig. 3 is a vertical section taken on the line y y of the same figure. Fig. 4 is a plan of the'heating gas-jet, and Fig. 5 is a longitudinal section of a bakers oven to which my invention has been applied.

Similar letters of reference indicate corresponding parts.

a is a plate or frame which is built into the front of the oven, so as to cover its mouth.

I) is the gas-supply pipe, its function being to introduce the heating-gas into the oven.

It is passed through the plate a, to which it is connected gas-tight.

c is a second gas-supply pipe. It is fed with coal-gas and is surrounded by a larger tube ('1, adapted to supply air for the combustion of the coal-gas at the jet in the end of the tube 0. The combustion of the coal-gas furnishes the flame which is relied upon for igniting the heating-gas supplied through the pipe 12.

f f are two ventilators in the frame a and are provided for the purpose of automatically regulating the supply into the oven of air necessary for the combustion of the heatinggas.

g is the heating-gas jet. It is circular in cross'section at'its rear end, which is screwed onto or over the end of the pipe I); but its cross-section is gradually modified into that of a horizontal and narrow slit 72, through which the heating-gas flows into the oven in a thin but broad and fan shaped stream. (See Fig. 4.) It will be noticed that the igniting-jet is under but a littlefarther into the oven than the nose of the jet g, so that the heating-gas will be lighted the moment it begins to issue from the slit h.

In order that the ventilators ff may close onto their seats automatically, the axes t' t' of their hinges are inclined out of the vertical, so that the weight of the ventilators will close them. (SeeFig. 3.) Further, in orderthat the latter may be easily turned, each is adapted to turn on a vertical conical point or center j. Opposite to the pointj the gudgeon 70 projects into a suitable hole.

Suitable apertures Z Z, fitted with suitable transparent material, are provided, through which the combustion can be watched. Further, spy-holes r, with swinging covers n, may also be formed in the plate.

To prevent the ventilators ff being opened by the draft into the oven beyond a certain limit, a stop m, Fig. 3, is provided for each of them, on which is an arm 19, which, by striking against the plate a, limits the opening of the door. The arm may, however, be turned up when it is desired to open the door entire1ye. g., when the igniting-jet is to be lighted.

The apparatus is used as follows: After the igniting-jet has been lighted the flue-dampers are opened and the heating-gas turned on. When the oven has been raised to the proper temperature, the heating-gas and the igniting-flame are turned off. The ventilators ff will then automatically close down upon their seats.

Referring to Fig. 5, A is the baking part of the oventhat is, the oven properand B is its door. ing the combustion-chamber and the latter the fiues, through which the products of combustion are led away through the flue K to the chimney-stack.

Having now particularly described and as close upon their seats by their own weight, certained the nature of my said invention and as set forth. in What manner the same is to be performed, In testimony that I claim the foregoing as I declare that what I claim ismy invention I have signed myname in pres- 5 In apparatus for heating bakers and silnience of two subscribing witnesses.

lar ovens by gas, the combination, with a l1eating-gas-supply pipe, of a fan-shaped jet, an JOIIAN LUDWIG WALDEMAR OLSEN. igniting-j et, and automatic ventilators adapt- \Vitnesses: ed to turn in one direction to admit air under \VILHELM CARL HANS JEDKIN,

[O the action of the draft and in the other to P. ITOFMAN BANG. 

